A good one I sometimes do is to get a bottle of cheapish BBQ sauce (nothing too spicy if lots of kids there) and add a splash of cider vinegar, some honey and some apple juice. It will be quite thin once you do this, but then put in a pan, bring to a simmer and turn the heat down to quite low. Let is sit on low for a couple of hours while it reduces and thickens.

My other favourite on a burger is a posh spicy tomatoe chutney, but kids probably won't be too keen on that.

Keep checking the BBQ sauce until it is the thickness you want. I'd say 1 to 2 hrs.

The chutney I have always bought rather than made from scratch. My mother in law made a good chilli tomato chutney but unfortunately she has gone to the great BBQ in the sky now and I don't have the recipe.